Add README to introduce project (with picture)

[jwflory]

Summary

Add README to FOSS Letters repository on GitHub

Background

A README that explains what the project is, what it does, and how it works is useful. Adding a picture of the project in action is also useful so people can see what this project looks like in practical use.

This is important to add before Imagine RIT as I used a link to this repository for our Imagine RIT booth application and also for promoting the project more widely on social media / blog posts.

Details

Something that does the following is enough:

• 4-5 sentences of what project is / how it works
• Credits / attributions to those involved
• What open source license is used for the project

Outcome

Someone can understand what this repo is when they navigate here or they are linked here on Imagine RIT website / FOSS@MAGIC website